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Ethernet Communications Modules, 3rd Edition, Rev. D
7-6
Chapter 7: Maintenance and Troubleshooting
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H2/H4-ECOM100 Indicators
The H2/H4 -ECOM100 module has several status indicators. The table below explains the
status for each indicator.
STATUS
The green OK LED on the H2-ECOM100 module is steady ON after a successful powerup.
If the LED fails to turn on, the module failed to powerup. It may not be properly installed or
it may be defective.
LINKGD Indicator
The green LINK (link good) LED is steady ON when the H2/H4-ECOM100 module is
correctly connected to an active device on the network and is receiving 5VDC operating voltage
from the PLC power supply. The LINK LED verifies that the proper cables are connected, and
the H2/H4-ECOM100 module is functioning correctly. If a mismatch with the 10/100BaseT
or 10BaseFL connections occurs this LED will not be illuminated.
ACTIVE Indicator
The red ACTIVE (activity) LED flashes to indicate that the module sees data travelling on the
network. If any network device is sending or receiving data, the ACT LED will be illuminated.
In idle mode (no network traffic) this LED is OFF. During heavy communication loads this
LED will be steady ON.
ERROR Indicator
If the H2/H4-ECOM100 module
red ERROR
indicator is
flashing
or
steady
ON, a fatal error
has occurred. The error may be in the H2-ECOM100 module itself, or a network problem may
be causing this symptom. The ERROR indication can be caused by a faulty ground, an electrical
spike or other types of electrical disturbances. Cycle power to the system to attempt clearing the
error.
100MBIT Indicator
The
green 100M
(100MB) LED is
steady
ON when Ethernet data is detected at 100BaseT
frequency.
Indicator Status Description
STATUS
(H2-ECOM only)
ON - Green Module is powered up and functional
OFF Module power-up failed
LINKGD
ON - Green Properly connected to network
OFF Not connected to network or incorrect configuration
ACTIVE
ON or Flashing Red Active network data
OFF Network idle
ERROR
ON or Flashing Red A fatal error has occurred
OFF No error present
100 Mbit
(H0-ECOM100 only)
ON Ethernet data is detected at 100 Mbit
OFF (with ACT LED ON) - Ethernet data is detected at 10 Mbit